what're the IO throughput (MB/s) for the test cases?
Thanks.
On 14-7-9 下午6:57, Xabier Elkano wrote:
Hi,
I was doing some tests in my cluster with fio tool, one fio instance
with 70 jobs, each job writing 1GB random with 4K block size. I did this
test with 3 variations:
1- Creating 70 images, 60GB each, in the pool. Using rbd kernel module,
format and mount each image as ext4. Each fio job writing in a separate
image/directory. (ioengine=libaio, queue_depth=4, direct=1)
IOPS: 6542
AVG LAT: 41ms
2- Creating 1 large image 4,2TB in the pool. Using rbd kernel module,
format and mount the image as ext4. Each fio job writing in a separate
file in the same directory. (ioengine=libaio, queue_depth=4,direct=1)
IOPS: 5899
AVG LAT: 47ms
3- Creating 1 large image 4,2TB in the pool. Use ioengine rbd in fio to
access the image through librados. (ioengine=rbd, queue_depth=4,direct=1)
IOPS: 2638
AVG LAT: 96ms
Do these results make sense? From Ceph perspective, It is better to have
many small images than a larger one? What is the best approach to
simulate the workload of 70 VMs?
thanks in advance or any help,
Xabier
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